Análise comparativa das propriedades reológicas no estado fresco e mecânicas do concreto autoadensável de cimento branco com adição de cinza volante

Abstract

The self-compacting concrete was developed by reason of the quick technology advancement of construction, being the main feature of this concrete the elimination of vibration, flowing under its own weight, achieving a good compaction even with high reinforcement ratios. It is relatively new in construction works, as compared of conventional concrete. Only in 2010 the first Brazilian standard emerged. At this work was produced and characterized three types of self-compacting concrete: with withe cement without ash, with white cement and 30% of ash, and with CP IV without ash (reference). For these, the reference mixture was initially dosed, using the Gomes, Gettu and Aguilló method. The rheological tests were: Slump Flow, Slump Flow T50 and Funnel-V, for check ability flowing, L-box, for check ability passerby, and V-Funnel 5min for segregation. All these tests showed that they characters were about self-compacting concrete. The tests of hardened state were compressive and traction diameter, to 7 and 28 days. The sample of self-compacting concrete with white Portland cement replacement by 30% ash showed better resistance value (44.05 MPa) and also a better cost/benefit ratio when compared with white concrete without gray.